Boring attachment for embroidery machine



Aug. 30, 1960 w. P. SlE-GEL 2,950,694

BORING ATTACHMENT FOR EMBROIDERY MACHINE Filed Feb. 10, 1958 s Sheets-Sheet 1 INVENTOR WAQf LR swan l s I Au 30, 1960 w. P. 5.59;; 2,950,694

BORING ATTACHMENT FOR EMBROIDERY MACHINE Filed Feb. 10, 1958 s Sheets-Sheet? VENTOR WAITEQ, 565A Aug. 30, 1960 w. P. SIEGEL BORING ATTACHMENT FOR EMBROIDERY MACHINE Filed Feb. 10, 1958 3 Sheets-Sheet 3 BY TTOR NliYS United States Patent ()1 BORING A'ITACIE/IENT FOR EMBROIDERY MACHINE Walter P. Siege], Paramus, N.J., assignor to Robert Reiner, gncorporated, Weehawken, NJ., a corporation of New ersey Filed Feb. 10, 1958, Ser. No. 714,254

9 Claims. (Cl. 112-83) The present invention relates to textile machines, and in particular to a bore attachment for an automatic shuttle embroidery machine.

A bore attachment for use on an automatic shuttle embroidery machine usually includes a boring tool or point which is mounted for reciprocable movement through a boring stroke, and actuating mechanism operatively connected to the boring tool for moving the same through the boring stroke. Heretofore the actuating mechanisms usually included a main or actuating cam on a drive shaft which Was selectively coupled to and decoupled from the boring tool by a latch-type coupling between the cam follower and its linkage or connection to the boring tool. Conventionally, the latchtype coupling wa controlled by a Jacquard-type of auto matic control which is characterized by having a punched paper control tape with a series of read-out fingers arranged to translate the tape information into the coupling and decoupling of the cam follower to the boring tool. Such attachment usually incorporated a strokeadjusting assembly operatively connected to the actuating mechanisms for the boring tool for increasing or decreasing the stroke length. Such stroke-adjusting assembly in turn was coordinated withthe overall machine cycle by connection to the Jacquard type of automatic control. Accordingly, during the automatic operation of the embroidery machine the bore attachment could be brought into operation to achieve a prescribed boring operation as determined by the tape control.

Practical experience with this type of bore attachment has indicated a number of shortcomings and disadvantages, including without limitation, rather poor control over the stroke length, variation in stroke length incident to operation necessitating periodic adjustment of stroke length to compensate for wearing, the need for constant maintenance due to the wearing and impacting of parts, and comparatively hi h noise level operation. Many of these disadvantages can be traced to the employment of the latch-type coupling which necessarily requires certain minimum clearances for operation thereby introducing looseness into the cam follower and its linkage which manifests itself in wearing of parts, noise and general loss of the tolerances initially designed into the machine.

Broadly, it is an object of the present invention to provide an improved bore attachment obviating one or more of the aforesaid difiiculties. Specifically, it is within the contemplation of the present invention to provide a bore attachment for an automatic shuttle embroidery machine which enables the accurate establishment and control of the stroke length of the boring tool or tools,

results in low noise level operation, minimizes wearing of parts and substantially reduces the need for servicing and maintenance.

In accordance with an illustrative embodiment demonstrating features of the present invention, the bore attachment for use in an embroidery machine in accordance with the present invention comprises a boring tool or point mounted for movement through a prescribed, adjustable boring stroke under control of actuating mechanisms which include a constrained cam control selectively coupled to and decoupled from the boring tool as part of overall automatic machine operation. In a typical embodiment, the actuating mechanisms include an actuating shaft, at least one actuating cam on the shaft, a cam follower on the actuating cam and cooperating therewith to provide a cam control, coupling means operatively connecting the actuating mechanisms to the boring tool, a further cam on the actuating shaft having camming surfaces coinciding with at least a part of the dwell portion of the actuating cam, and means mounting the cam follower for lateral shifting whereby the cam follower may be shifted from the actuating cam onto the further cam for disabling the actuating mechanism.

As a further feature of the invention, a stroke-adjusting assembly'is operatively connected to the actuating mechanism for establishing various stroke lengths and is normally locked against adjustment by a brake. Advantageously, the brake is arranged to release the strokeadjusting assembly for adjustment to establish dilferent stroke lengths when the actuating mechanisms for the boring tool are deactivated by shifting of the cam follower onto the further cam which precludes the transmission of motion via the coupling means to the boring tool.

The above brief description, as well as further objects, features and advantages of the present invention, will be more fully understood by reference to the following detailed description of an illustrative bore attachment for use on an embroidery machine in accordance with the present invention, when taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is a front elevational view of a bore attachment demonstrating features of the present invention, shown with the boring tool thereof in operative relation to the shuttle box needle and associated mechanisms of the embroidery machine;

Fig. 2 is a sectional view taken substantially along the line 22 of Fig. 1 looking in the direction of the arrows, showing the bore attachment in its position corresponding to the withdrawal of the boring tool or point from the cloth of the embroidery machine, the dot-dash lines showing the bore attachment with the boring tool or bore extended into the cloth at its maximum stroke length; and

Fig. 3 is a sectional View taken substantially along the line 3-3 of Fig. 2, with the dot-dash lines showing the position of the bore attachment and its tool at its minimum stroke length.

Referring now specifically to the drawings, brief reference will be made to the details of a typical automatic shuttle embroidery machine of the type generally known in the prior art, such as that shown in US. Patent No. 2,030,495 to Bretschneider, to facilitate an understanding of the environment for the present improved bore attachment. Such typical embroidery machine includes an embroidery frame (not shown) which advances the cloth C along a prescribed path past a group of side by side shuttle boxes 10 mounted on a horizontally extending shuttle box rail 11. The cloth is moved both horizontally and vertically under control of the Jacquard control of the machine, as is generally understood. As seen in Fig. 1, each of the shuttle boxes 10 includes a needle hole 12 adapted to receive its associated needle 14 and a bore point hole 16 adapted to receive a bore point or tool 18.

The series of spaced needles 14 are supported in side by side spaced relation on a needle bar 20 which is mounted for reciprocation along a path at right angles r ce the frame part 24 of the embroidery machine. The needle bar 20 is coupled via the 'de bar 22 and a crank arm 25 to a needle actuating shaft 26 which is reciprocated by conventional mechanisms of the embroidery machine (not shown since they do not contribute :to an understanding of the present invention) .The. embroidery. thread, 'generally designatedlby the 1etter1T,is ,threadedalong a smuousllpath including the 'first and second. thread-feeding rod 28,30, which are'moved in a prescribed sequence to deliver thelembroiderythread To to the .needle.14 for coaction withrthe 's huttlemmechanisms. [Theihread feeding rod 28 is mounted on a supporting arm 32 which is connected to.and controlledtbya shaft 34gandjsimilarly the thread feeding rod 30 is carriedon a supporting arm '36 which islconnected to a shaft 40. 'As is generally understood, the thieadfeedingrodsZS, 311 aremoved relative 'to each othertoiproduce a slack in the thread T to allow the associated needlewto carry therthread into the cloth. In this typical arrangement, thefirstor-r front thread feeding rod 3,2,n1ovesr clockwise and the second or rear thread feeding rod 36 moves counterclockwise to produce'the slack jinthe thread. After the needle 14.has penetrated the cloth C, 'the respective rods move in'the opposite direction to draw more thread'T from the supply for the next stitching stroke. 7 The bore pointrortool 18'is carried on a bore point bar 42 which in turn is mounted .on the frame part 24 by one or more guide rods 44 for of Fig. 2) wherein the bore point 18 is clear of the cloth C and spaced from the front face thereof. tothe extended or operative position (see the dot-dash lines in Fig.2) wherein the borepoint 18 has penetrated the cloth Ca-nd isvreceived within the corresponding clearance hole'16 provided iu rthershuttle box 10.. For further details of the construction and operation of this'typical type of embroidery machine, reference may be made to the prior art.

In accordance with the present invention, the bore attachment for reciprocating the one or more boring tools or points '18 on the supporting rail or bar 42 is generally designated by the reference numeralSO and includes a support or frame 52 having upright sidewalls 54, 56. The support or frame may be a part of the main frame of the embroidery machine or as an'attachment-tojhe main frame. Extending between the opposite side walls 54, 56 is a main or actuating shaft 58 journaled' in appropriatebearings 60, 62. It should be apprecia'tedthat a number of attachments may be provided at spaced locations along the length of the embroidery machine; and accordingly the actuating shaft 58, which is shown broken away at its opposite ends, usually extends to'further attachments arranged to the left and right of the arrangement illustrated in the instant drawings and is connected at one end to an appropriate drive motor. Fixed to the driven actuating shaft 58' are a number of cams including an, actuating cam 64 having a peripheral camming surface "64a, a second actuating cam 66 having a peripheral camming surface 66a which is spaced' from the actuatingcam 64; and a third auxiliary cam 68 having a peripheral camming surface 68a which is disposed immediately adjacent to theactuating cam 64. The camming surface 64a of the actuating cam 64 has a dwell portion which establishes a'ret'racted position for the boring tool or point 18. and 'a rise portion which establishes an advanced position for the boring tool or point; and the camming surface 66a of the actuating cam 66 is complementary to the camming surfaces 64a. 'I'hefactuating cams 64,66'to gethef provide a constrained cam drive'for the bore points and'are' coupled thereto by mechanisms which will now bedescribedtfi V 7' 1 v V Spaced from andparallel to the main or actuating shaft 58; is a'c'am follower shaft 70 which is fixed between'the opposite side walls ,54, 56 of the .frame or support '52; Journaled on the camfollower shaft, 70 .isflthe cam 011 reciprocation from a retracted position (see the full lines 7 lower, generally designated by the reference numeral 72 whichincludes-a sleeve-like body 72a journaled -lon the shaft between stop collars, a first follower arm 72b adjacent the cam 64, a second follower arm 72c adjacent the cam 66 and a rocker arm 72d intermediate the follower arms 72b,v72c. The arm 72b serves as a support for a follower roller 74 which rides on the peripheral camming surface 640 of the cam 64, the arm 72c serves as a'support for a follower roller 76 which rides on the peripheral camming surracesea or the actuating cam'66','an'd the, arm 72 serves as a rocker output for the constrained cam control. The follower roller 74 is mounted for lateral rot-side to'side shifting from the position-illustratedrinthedrawings into engagement with the peripheral camming 'su-rfacen68a of the auxiliary cam 68 by journaling the follower roller 74 on a stub shaft 78 meets the follower arm 72b. To enable such shifting of the followerrroller 74, the auxiliary cam 68 has a substantial peripheral "segment coinciding with the dwell portion of the actuating cam 64, as indicated by the reference numeral .80 (see Eig. 2). At h t m in t r t c c when e o ow r l r 74 is on the dwell portion of the actuating cam 64, thefollower roller may be shifted laterally onto the coinciding portion of the auxiliaryrcam 68,'which is seen in Fig, 2 to be circular. Due to the complementary development of the actuating cams ,64, 66, no provision need be made for shifting of the cam follower 76 fromftheperiphe ral camming surfaces 66a of the actuating cam 66 since the cam follower 76 willbe at a clearanceposition at the rise portion of the cam: 66 when thecamfollower 74 is at the dwell portion of the cam 64 Accordingly shifting ofrthe cam follower 74 onto the auxiliary cam 68 precludes motion transferred to the cam follower-72 despite the.continned rotation of the actuating shaft 58 and thereby disables the drive to the boring points or. tools 18. V

'Mechanisms are provided for periodically shifting'the follower roller 74 from its position in engagement'with the actuating cam 64 onto the circular auxiliary cam 80 under the automatic control of the punched paper control tape of the Jacquard device incorporated .in the embroidery machine. In this embodiment of the invention, the shifting mechanism includes a double arm lever 82 whichis mounted by an integral stud 82a on the frame for rocking movement in a substantially horizontal plane and about the stud as its vertical 'axis. As seen best in Figs. 1 and 2, the lever 82 is journaled son a plate .or bracket 84 fixed to the sidewall 54 of theframe. 52. The 82b of the lever ,82 carries a'pair of spaced pins 86, 88 which engage the opposite faces of the follower roller 74 to position the same either in the position illustrated in the drawingsinengagement with the actuating cam 64 or the shifted position in e ugagement the auxiliary cam 68. .The lever 82.'is periodically rocked by coupling the arm 82c to a shift control shaft :89 (see Fig. 1) which is controlled from the Jacquard control and is periodically indexed through a prescribed angular traverse incident to' the control function. The shift-control .shaft 89 is connected via a couplings-0d 90 to one arm of a bell crank 92 which is pivoted at 94 on a portion oftthe machine frame, the other arm of thebell crank being coupled .by the connecting rod 9,6 10 thearm 820 of the llever 82. a In response to a pushing force on the connectingrod 96 (i.e. a thrust to the right in Fig.1 resultingfromr-the pivotal movement of the bell crank 92 in the clockwise irection aboutrthe pivot 94), the, lever 82 isrrocked .to shift, the follower roller 74 onto the auxiliary or dwell ca n68; and cor respondingly in response to a prescribed thrust to the left in Fig l to the connecting rod.96 in response to counterclockwise pivotal movement .of the bell crank 92, the follower roller 74- is restoredtto its position in engagement with the actuating cam 64. Ac-

cordingly, by the simple expedient of indexing the..shift between the cam follower 72 and the supporting rail 42 for the boring points 18 for coupling movement of the rocker arm 72d under control of the constrained cam system to the boring points. The adjustable stroke linkage includes a coupling arm or link 98 supported at an adjustable pivot 100 and having a pivotal connection 102 at its lower end to connecting links 104, 106. The connecting links 104, 106 have a pivotal connection 108 at their forward end to an upstanding coupling arm 110. The coupling arm 110 has a pivotal connection 112 at its upper end to a bell crank 114 pivoted on a rocker shaft 116. The bell crank 114 is coupled to the supporting rail 42 for the boring points by a connecting or tie rod 118. Upon a consideration of the showing in Fig. 3, it will be appreciated that an upward thrust imparted to the coupling arm 110 brings about counterclockwise turning of the bell crank 114 about the rocker shaft 116 and moves the rail 42 and the boring point 18 through a prescribed forward stroke; and conversely a downward thrust imparted to the coupling arm 1 causes the rail 42 and the boring point or tool 18 to retract through a prescribed return stroke. The adjustable stroke linkage, including the rocker arm 72d which pivots about the shaft 70, the rocker link or arm 98 which pivots about the adjustable pivot 100, and the connecting links 104, 106 with their respective pivotal connections 102, 107 to the rocker arms will be recognized as a four-bar coupling linkage for transmitting motion from the follower 72 to the coupling arm '110 and to the boring points 18. With the rocker arms 72d, 98 in substantial parallelism (i.e. with substantially equal spacing between the pivots 70, 109, 107, 102 as shown in Fig. 3), the rocking motion imparted to the arm 72d by the follower 72 under control of the constrained cams will manifest itself as a rather small vertical displacement of the coupling arm 110 and a comparatively large horizontal displacement (see the dot-dash lines in Fig. 3) from the illustrated position of the adjustable stroke linkage. Small vertical displacement of the coupling arm 110 will move the boring points 18 through a short forward thrust, corresponding to idling of the points out of contact with the cloth C. From the generally understood principles of linkages, it will be appreciated that the vector analysis of the displacing forces on the coupling arm 110 depends upon the physical relationship of the pivot 100 to the pivot 70 which in turn determines the arc traversed by the pivots 102, 10-7 and the relative position of the connecting links 104, 106 which couple the follower 72 to the coupling arm 110. Movement of the pivot 100 of the rocker arm 98 toward the pivot 70 will progressively increase the vertical component of the motion imparted to the coupling arm 110 and thus increase the length of the stroke of the boring point 18 under control of the constrained cam system. For example, and as shown in Fig. 2, when the rocker arm 98 is moved out of its substantially upright position into an angular position, the geometry of the four-bar coupling linkage is such that the links 104, 106 are appreciably lifted at their forward ends (note the dot-dash lines in Fig. 2) causing a corresponding increase in the length of the stroke of the boring points under control of the constrained cam system. At the various intermediate positions for the pivot 100 between the limit positions illustrated in Fig. 3 and Fig. 2, varying bore strokes are established under control of the constrained cam system.

In order to move the pivot 18%) for the rocker arm 98 to the various positions corresponding to different stroke adjustments, there is provided a stroke-adjusting assembly, generally designated by the reference numeral 120, which includes a control shaft 122 journaled between the side walls 54, 56 of the frame 52. Carried on the control shaft 122 are a pair of identical and confronting face cams 124, 126 provided with respective spiral cam tracks of progressively increasing radius, the cam track 126a being seen in Fig. 3. The spiral cam tracks are engaged by respective cam followers 128-, 130, carried on a common U-shaped follower arm 132. Specifically, and as seen best in Fig. 3, the cam followers 128, 130 are in the form of shoes of hardened steel including curved surfaces (i.e. surfaces 130a, 13%), which are spaced apart to contact the inner and outer constraining walls of the associated spiral cam track. The shoe or follower 130 for the face cam 126 is pivoted on a pin 134 and in a similar fashion the shoe or follower 128 for the face cam 124 is pivoted on a pin. The use of shoes or followers which provide area contact with the respective inner and outer walls of the constraining spiral cam tracks minimizes the tendency of the followers to wear the cam tracks as a result of the axial thrust imparted to the U-shaped follower arm 132 incident to operation of the machine. If rollers be used in lieu of the shoes, line contacts would be made with the opposite walls of the respective spiral cam tracks which would cause uneven wearing. The legs 132a, 132b of the U-shaped cam follower 132'are coupled to a rockable carrier 136 having the adjustable pivot which supports the rocker arm 98. As seen best in Fig. 1, the carrier 136 is pivoted on a supporting shaft 138 which is fixed between the 0pposite side walls 154, 156 of the support and includes a sleeve-like body portion 136a and upstanding standards 136b, 1360. The standards 1361), 136s are traversed at their upper ends by the pivot pin 100 to adjustably suspend the rocker arm 98 for pivotal movement. The position of the carrier 136 is established by the U-shaped follower arm 132 which has its arms 132a, 132b connected to the standards 136b, 1360 by a coupling pin 140 which is seen to extend through a clearance hole 142 provided in the rocker arm 98 (see Fig. 3). It will be appreciated that the position of the pivot pin 100 for the rocker arm 98, which establishes the geometry of the adjustable stroke linkage, can be varied by the control cams 124, 126 of the stroke-adjusting assembly 122 which are coupled to the carrier 136 via the follower 132. The control shaft 122 for the cams 124, 126 is also indexed stepwise through prescribed angular traverses by the conventional Jacquard control employed in the embroidery machine.

Operatively connected to the stroke-adjusting assembly 120 is a brake 144 which precludes adjustment of the adjustable stroke linkage 72d, 98, 104, 106 of the bore actuating and control mechanisms. In this illustrative embodiment, an electrical brake 144 is mounted on the shaft 122 of the stroke adjusting assembly 120. The electrical system to the brake 144 is such as to normally energize the brake thereby holding the shaft 122 against indexing movement which serves to fix the position of the carrier 136 for the adjustable pivot of the fourbar coupling linkage. In this embodiment, and as seen in Fig. l, the energization lines 146, 148 for the brake 144 include a normally-closed microswitch 150 in one side thereof such that the brake 144 is normally energized. The actuator 150a for the microswitch 150 is positioned beneath the connecting rod 90 of the linkage which connects the shiftable follower 74 to the automatic punch tape control and is arranged to be opened by contact with the connecting rod 90 when the follower 74 of the actuating mechanism is shifted onto the auxiliary or idle cam 68. Accordingly, when the rod 90 is pulled downwardly to disable the drive to the boring tools 18, after which the adjustment for stroke length can be made, the contact of the rod 90 with the microswitch 150 releases the electric brake 144 such that the control shaft 122 may be indexed through one or more steps to provide the requisite stroke adjustment.

Reference will now be made to a typical sequence of operation to facilitate a more thorough understanding of the invention.

At the start of any operation the stroke-adjusting assembly which is adjusted by the Jacquard controlof the embroidery machine establishes a prescribed position bfgadjustment for the movable pivot 100 of theadjustable stroke linkage which couples the cam follower 72'to the rail :42 forttheboring points 18. Boring with a prescribed strokelength, as established by the stroke adjusting as sembly 120, will continue for as long as the camfollowr "7.4 is .on the actuating cam 64 of the constrained actuating :cams =64, 66. .Whenthe boring operation is to be discontinued. under control of the punched tape in accordance .with the established embroidery pattern under process; the shaft 89 is indexed inan amount sufficient toishiftitheifollower 74ffrom its position in engagement Wil'h'lth carnmingisurfac'e 64a into contact with with the circulartcamrning surface68a of the auxiliary or idle cam .68; Of course the punchedtape control is aranged to turn thecontrolshaft 89 at the time in the operating cycle when the'tfollower roller 74 is engagedwith the coinciding regions 80 bf the cams 64, '68. 7

- wheirthe cam follower 7.4 is shifted onto the auxiliary or idle cam 68, continued rotation of the complementary actuatingicams .64, .66 imparts no motion to the follower .72T311d accordingly the boring tools or points 18 are noilonger driven through their boring stroke. Of course thehoring tools or points are out of the cloth C since the drive .is discontinued only when the dwell portion of the actuating cam 64 is opposite the follower roller 74, corresponds to the retracted position of the boring points illustrated in Fig. 3. a :If the particular embroidery pattern requires no adjustment of the stroke of the boring points or tools, the machinisms remain in their adjusted position with the follower roller 74 on the idler cam 68 for the period determined by the Jacquard control. After the prescribed period has elapsed in accordance with the overall embroidery. pattern, the shaft 89 is indexed in the opposite direction to bring the cam follower roller 74 onto the actuating cam 64, thereby again coupling the complementary actuating cams 64, 66 to the boring points. Here again,'the lateral shifting of the follower roller 74 must occur when the coinciding dwell regions 80 of the cams are contacted by the follower roller 74. If an adjustment is required in the bore stroke, such adjustment is made during the interval when the ,bore points 18 are retracted and are not driven. The length of this interval is mtablished by the time which the cam follower 74 isin contact with the idler or auxiliarycam 68 As previously explained, downward movement of the coupling rod 90 opens the normally closedmicroswitch 150 associated with thebrake 144 on the control shaft "122 of the stroke adjusting assembly 120 thereby enabling the shaft 122 to be indexed through the prescribed, interval by the Jacquard control which, in turn, will-establish a different adjusted position for the movable pivot 100 of the adjustable stroke linkage and therebyestablis'h adifierentstroke length for the boring points18 when again activated by the lateral shifting of the follower roller 74 onto the actuating cam 64. 1 From the foregoing it will be appreciated that the bore attachment of the present invention is capable of precise adjustmentrforrstroke length; and when the adjustment is .oncejestablished, the constrained cam system is effective to repeatedly drive the bore points through. the establishedstroke' 'The mechanisms are such that little wearinggoccurs over prolonged periods of use. The stroke adjusting assembly, which is locked during the intervals when the boring points are active, is arranged to establish 1 7 [different stroke lengths; .and once the different stroke :lengths are established; the stroke-adjusting assembly is again locked to preclude .loss of the est'ablishedadjustment. The disclosed mechanisms are of a type'which promote operation at a relatively low noise level and acquire but minimum servicing and maintenance;

A latitude of modification, substitution and change is intended inthe foregoing disclosure, and in some inlstancestsomerfmfures of the inventionwill 'beiused .without a:,c'orresponding' use. of other features. Accordingly, v.it istapprnpriat'e :.that the :claims -be construed broadly and in a mannenconsistent with fliiGlSPiIit. and scopeof'theinventioni i r i 'iWhatI claim is: r :1

I 1. A .bore attachment foruse in'embroidery'rmachines comprising a boning tool, means operativelyrconnected to and mounting'said boring tool for movement througha boring stroke, and actuating mechanisms ioperatively connected to' said boring tool for moving same through saidboring st'rok e, said actuating mechanisms including an actuating shaft," first and second :actuatingicams' on said actuating shaft having complementary .camdevelop one cam follower maybe shifted from said one actuating cam onto said further cam for disabling said actuating mechanisms, and means operatively connected to said one cam follower for 'per iodically shifting said one cam follower. i

"2. A bore attachment for use in embroidery machines comprising a boring tool, means operatively connected to and mounting said boning'tool for movement through a boring stroke, and actuating mechanisms operatively connected to said boring tool for moving same through said boring stroke, said actuating mechanisms including an "actuating shaft, first and second actuating cams on said actuating shaft having complementary cam develop ments, respective cam followers on said first and second actuating cams and cooperating therewith to provide a constrained cam control for said actuating mechanisms, coupling means including a stroke-adjusting assembly operatively connecting said actuating mechanisms to said boring tool, a circular cam on'said actuating shaft in side by side relation to one ofsaid actuating cams and having a radius selected to completely inactivate said boring tool and to coincide with the dwell portion of said one actuating cam, means mounting the one cam follower on said one actuating cam forlater-al shifting whereby said one cam follower may be shiftedfrom said one actuating cam onto said circular cam for disabling said actuating mechanisms, and means operatively connected to said one cam follower for periodically shifting said one cam follower laterally. I I p 3. In combination with an automatic shuttle embroidery machine, a bore attachment comprising a boring tool, -means mounting said boring tool forlinear reciprocation through a boring cycle, bore'actuating and controlling mechanisms for moving said boring" tool through a prescribed and adjustable stroke, said mechanisms including a support, tin-actuating shaft rotatably mounted on said support and adapted to be driven, first, second and third cams on said actuating shaft and driven thereby, said first and second cams being complementary to each other and having snbstantially'identical camming surfaces with a dwell portion which establishes a retracted position for said boring tool'and a rise portion which establishes an advanced position for saidboring tool; said third cam being disposed adjacent to' said first cam and having camming surfaces adapted for complete inactivation of said boring tool and coinciding with at least a part of the dwell portion of said first cam, first and second cam followers, means mounting said first cam follower for lateral shifting movement between positions in engagement respectively with said first 'andthird .cams, and meanslnounting said second camfollower in engagement with said second cam.

4-. In combination with an automatic shuttle embroidery machine, a bore attachment comprising a boring tool, means mounting said boring tool for linear reciprocation through a boring cycle, bore actuating and controlling mechanisms for moving said boring tool through a prescribed adjustable stroke, said mechanisms including a support, an actuating shaft rotatably mounted on said support, an actuating cam on said actuating shaft and driven thereby, said actuating cam having camming surfaces with a dwell portion which established a retracted position for said boring tool and a rise portion which established an advanced position for said boring tool, a further cam disposed adjacent to said actuating cam and having camming surfaces coinciding with at least a part of the dwell portion of said actuating cam, a cam follower, means mounting said cam follower for side to side shifting movement between positions in engagement respectively with said actuating cam and said further cam, a stroke linkage coupling said cam follower to said boring tool, adjusting means operatively connected to said linkage for establishing various initial adjusted positions for said linkage relative to said support whereby the eifective stroke length in said boring cycle may be varied, means operatively connected to said cam follower for periodically shifting said cam follower onto said further cam whereby said bore actuating and controlling mechanisms are eifectively decoupled from said boring tool, holding means operatively connected to said adjusting means and normally precluding adjustment of said linkage, and means for disengaging said holding means in response to decoupling of said bore actuating and controlling mechanisms whereby said adjusting means may be manipulated to establish a different initial adjusted position for said linkage to vary the efiective stroke length in said boring cycle.

5. A bore attachment for use in embroidery machines comprising a boring tool, means operatively connected to and mounting said boring tool for movement through a boring stroke, and actuating mechanisms operatively connected to said boring tool for moving same through said boring stroke, said actuating mechanisms including an actuating shaft, at least one actuating cam on said actuating shaft, a cam follower on said actuating cam and cooperating therewith to provide a cam control for said actuating mechanisms, coupling means including a stroke-adjusting assembly operatively connecting said actuating mechanisms to said boring tool, a further cam on said actuating shaft in Side by side relation to said actuating cam and having a radius selected to coincide with the dwell portions of said actuating cam, and means mounting said cam follower for lateral shifting whereby said cam follower may be shifted from said actuating cam onto said further cam for disabling said actuating mechanisms, said stroke-adjusting assembly includes linkage means coupling said actuating mechanisms to said boring tool, and means including a control shaft and a control cam operatively connected to said linkage means for varying the efiective coupling between said actuating mechanisms and said boring tool whereby said boring stroke may be varied by adjustment of said control shaft, a brake operatively connected to said control shaft, and means for disengaging said brake and operable in response to lateral shifting of said one cam follower from said one actuating cam onto said circular cam.

6. In combination with an automatic shuttle embroidery machine, a bore attachment comprising a boring tool, means mounting said boring tool for reciprocation through a boring cycle, bore actuating and controlling mechanisms for moving said boring tool through a prescribed stroke, a stroke adjusting assembly operatively connected to said bore actuating and controlling mechanisms for establishing various stroke lengths, and holding means operatively connected to said stroke-adjusting assembly for normally precluding adjustment of said bore actuating and controlling mechanisms during operation said boring tool.

7. In combination with an automatic shuttle embroidery machine, a bore attachment comprising a boring tool, means mounting said boring tool for reciprocation through a boring cycle, bore actuating and controlling mechanisms for moving said boring tool through a prescribed stroke, means for deactivating said bore actuating and controlling mechanisms, a stroke adjusting assembly operatively connected to said bore actuating and controlling echanisms for establishing various stroke lengths, brake means operatively connected to said strokeadjusting assembly and normally precluding adjustment of said bore actuating and controlling mechanisms, and means for disengaging said brake means in response to decoupling of said bore actuating and controlling mechanisms whereby said stroke-adjusting assembly may be actuated to varying the effective stroke length in said boring cycle.

8. in an embroidery machine, an embroidery tool, means operatively connected to and mounting said tool for movement through a work cycle, and actuating mechanisms operatively connected to said tool for moving same through said work cycle, said actuating mechanisms including an actuating shaft, first and second actuating cams on said actuating shaft having complementary cam developments, respective cam followers on said first and second actuating cams and cooperating therewith to provide a constrained cam control for said actuating mechanisms, coupling means operatively connecting said actuating mechanisms to said tool, a circular cam on said actuating shaft in side by side relation to one of said actuating cams and having a radius selected to coincide with the dwell portion of said one actuating cam, means mounting the one cam follower on said one actuating cam for lateral shifting whereby said one cam follower may be shifted from said one actuating cam onto said circular. cam for disabling said actuating mechanisms, and means operatively connected to said one cam follower for periodically shifting said one cam follower laterally.

9. In an automatic shuttle embroidery machine, a support, an embroidery tool, means mounting said tool on said support for movement through an operating cycle, and actuating and controling mechanisms for moving said tool through said cycle including an actuating shaft rotatably mounted on said support and adapted to be driven, first, second and third cams on said actuating shaft and driven thereby, said first and second cams being complementary to each other and having substantially identical camming surfaces with dwell and rise portions, said third cam being disposed adjacent to said first cam and having camming surfaces coinciding with at least a part of the dwell portion of said first cam, first and second cam followers, means mounting said first cam follower for lateral shifting movement between positions in engagement respectively with said first and third cams, means mounting said second cam follower in engagement with said second cam, shifting means operatively connected to said first cam follower, and means in controlling relation to said shifting means for laterally shifting said one cam follower between said positions.

References Cited in the file of this patent UNITED STATES PATENTS 651,828 Copland June 19, 1900 1,027,789 Zahn May 28, 1912 1,118,411 Granz Nov. 24, 1914 1,162,009 Zahn Nov. 30, 1915 1,550,200 Bretschneider Aug. 18, 1925 1,651,402 Midgley Dec. 6, 1927 

